SSH sessions terminate abruptly with message: Corrupted MAC on input. Disconnect

iteye_13493

于 2014-09-23 20:11:13 发布

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文章标签：网络运维

本文链接：https://blog.youkuaiyun.com/iteye_13493/article/details/82605232

本文探讨了SSH会话突然中断的问题，并提出了两种可能性：一是传输过程中数据被篡改导致加密层出现错误；二是硬件故障（如CPU或RAM问题）在数据接收后损坏了数据。文中还提到了TCP卸载引擎可能导致此类错误的情况。

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http://serverfault.com/questions/338439/ssh-sessions-terminate-abruptly-with-mes

On-the wire level errors should be eliminated by the Ethernet and TCP checksums. It is possible that corrupted Ethernet frame / IP packet could slip now and then up to the higher levels of the networking stack, but it really isn't very probable and definitely shouldn't lead to a repeatable issue. Therefore I see two main possibilities:

1) There's somebody fooling with your transmission, modifying in-transit data so that the Ethernet/IP checksums match, but encryption layer sees rubbish, or

2) More probably, you have some hardware error, most probably CPU or RAM, that damages data after it has been taken off-the-wire. Again, ECC RAM should reduce probability of this happening, but overheating / dying CPU can play hell with data.

I don't know if TCP Offload Engine with a mis-behaving NIC/driver could produce such errors, but that line of thought could explain (changed driver?) the correlation of problems with the update.

tcp checksum offload:

http://blog.youkuaiyun.com/ixidof/article/details/6658125